Rotational energy is stored by the Mazda 6 Flywheel to allow the engine to provide power to the gearbox in a smooth manner in all Mazdas with a stick shift and also provide a smooth surface for the starter and the clutch to operate against. This heavy steel disc is bolted to the crankshaft and smooths out the burst-like power strokes of the combustion engine, and its inertia fills the gaps to make a Mazda feel solid at idle and responsive on the road. By twisting the key on the Mazda, the starter gear engages with the Flywheel ring gear and spins the crank until spark and fuel replace it, after which the clutch pedal is released and the disc closes between the Flywheel face and pressure plate to transfer torque to the transmission. Over the years two styles have emerged, the solid single piece design and the dual mass unit that is designed to absorb vibration, using a secondary mass and a spring-filled damper which gives gentler gear changes, and in later 6 editions, higher torque. It is possible to get a solid unit resurfaced to correct minor spots of heat or grooves, but a dual mass item typically needs replacement due to the tendency to empty out the material, disturbing the accurate spacing of its two pairs, and broken internal springs causing rattling or shaking in the driveline. Too much heat on the clutch, deformed faces, or broken ring gear teeth are still the highly prevalent causes that cause Mazda owners to require a new disc.
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